Adjusting The Travel Stops; Preparing For Installation - Emerson Fisher A11 Instruction Manual

Instruction Manual
D104223X012

Adjusting the Travel Stops

CAUTION
When using manual or power actuators, adjust the actuator travel stops so the disk stop in the valve body does not absorb
the output of the actuator.
For actuators without travel stops, the actuator must be properly mounted to prevent it from driving the valve disk against
the valve disk travel stop.
Failure to limit actuator travel as described in this section can result in damage to the valve shafts or other valve parts
Note
An "S" is visible on both the valve shaft and valve body. When the valve disk is closed, the "S" on the shaft aligns with the "S" on
the valve body.
1. Locate the actuator travel stop that establishes the closed position of the valve disk. When adjusting the travel stop
make sure that the disk is from 0 to 0.76 mm (0 to 0.030 inch ) away from the internal stop in the valve body. This
adjustment is necessary to be certain that the actuator output torque is fully absorbed by the actuator travel stop
rather than the stop in the valve body.
For actuators without travel stops, the actuator must be properly mounted to prevent it from driving the valve disk
against the valve disk travel stop.
2. To mount an actuator without travel stops, first, if necessary, remove the actuator from the valve. Then, position
the valve disk from 0 to 0.76 mm (0 to 0.030 inch) away from the internal stop in the valve body.
3. Now, travel the actuator to the maximum position. Keep the actuator in the maximum travel position. Return the
actuator to the valve, taking care not to disturb the position of the valve disk.
4. Mount the actuator on the valve using proper bolts with locking washers to achieve a secure fit.
5. Before installing the valve/actuator assembly in the process line, cycle the valve several times to be sure the valve
disk returns to the proper position.

Preparing for Installation

WARNING
If the A11 valve is equipped with a fail‐open actuator, remove the actuator before installing the valve/actuator assembly or
cycle the valve into the fully closed position. Then, to avoid possible personal injury or property damage, take appropriate
steps to ensure that the actuator does not cause the valve to open during installation.
1. If the valve and actuator have been purchased separately or if the actuator has been removed for storage, travel
stop adjustment, or maintenance, mount the actuator before inserting the valve/actuator assembly into the line.
Refer to the actuator instruction manual for mounting and adjustment procedures.
CAUTION
To avoid product damage, inspect the valve before installation for any damage or any foreign material that may have
collected in the valve body. Also remove any pipe scale, welding slag, or other foreign material from the pipeline.
A11 Valve
August 2017
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